Tomas Srnka / LINUX s.r.o.
2008-Jun-03 04:58 UTC
[Xen-users] disk performance (memory problem??)
Hello, I have a strange problem. I''m using XEN on OpenSuSE 10.2 machine for over a year. Everything is fine, until ID of a virtual machine reaches 38-40. Then, my disk performance drops rapidly. From 70MB/sec to 5-6MB/sec. If I restart the host server, it will be fine again, but I don''t want to do that. Here is hdparm test: baxen01:~ # hdparm -Tt /dev/sda /dev/sda: Timing cached reads: 880 MB in 1.99 seconds = 442.31 MB/sec Timing buffered disk reads: 20 MB in 3.33 seconds = 6.01 MB/sec baxen01:~ # hdparm -Tt /dev/sdb /dev/sdb: Timing cached reads: 822 MB in 2.00 seconds = 410.96 MB/sec Timing buffered disk reads: 18 MB in 3.32 seconds = 5.43 MB/sec baxen01:~ # hdparm -Tt /dev/sdc /dev/sdc: Timing cached reads: 56 MB in 2.06 seconds = 27.22 MB/sec Timing buffered disk reads: 16 MB in 3.22 seconds = 4.97 MB/sec xm list took 6 secs to print the machines. baxen01:~ # xm list Name ID Mem(MiB) VCPUs State Time(s) Domain-0 0 1070 8 r----- 150349.7 hauratonsro 35 196 1 -b---- 1086.3 linuxsro01 1 1536 4 r----- 1300479.3 megabookssro 3 512 1 -b---- 49968.2 sageteam01 41 256 1 -b---- 94.2 vermont 40 256 1 -b---- 896.9 wigwam 6 196 1 -b---- 8231.0 The configuration of the machine is: 2xIntel xeon 5050 (dualcore+hyper threading), 4GB RAM, 6x400GB (3xRAID1 + LVM on top of it). Do you have any idea, what the problem can be? Thank you -- S pozdravom / Best regards *Tomas Srnka, LINUX s.r.o.* Project Manager & Project leader of LinuxOS.sk website: http://www.LinuxOS.sk, http://www.LINUXsro.sk e-mail: tomas.srnka@linuxsro.sk mobile: ++421 949 246 313 ICQ: 262-839-018 -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean. _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users